The final two bugaboos are the axle tubes and the wheel bearings/backing plates. The 356B has drum brakes and a slightly complicated set-up for the rear bearing carriers and axle seals. We have new bearings and seals, I will post pictures of those when I install them in a couple days.
The transaxle has has swing axles and they are shimmed to the differential by using multiple gaskets as necessary in differing thicknesses. There is a factory tolerance for the elbow joints but I cannot for the life of me figure out how it would ever be measured. You would need to put a trained hamster inside of the flange with a feeler gauge and ask him what the clearance was after you torqued them down with him inside. If his tail got stuck between the parts, that would ruin your measurement. Luckily, all of the books describe a proper "feel" for the axles once installed that is plenty accurate. They need to be tight enough for slight resistance when moved by hand but not so tight as to bind-up. That condition would severely affect the reaction of the suspension components. The swing axles:
